Improved beaming-tool



ALEXANDER CONKLIN, OF. HARTFORD, CONNECTICUT. M

Letters Patent No-.- 75,628, dated March 17, 1868.-

IMPROVED REAMING-TOOL.

dip Stimul norm in to tips: flrtitrs patent mm making out of the 5mm.

TO ALL W HOM IT MAY CONCERN:-

Be it known that I, ALEXANDER GONKLIN, of Hartford, in the county ofHartfoi-d, and State of Connecticut, have invented a new and useful Expanding Reamer; and I do hereby-declare that the following isa full, clear, and exact description of the construction and operation thereof,reference being had tothe accompanying drawings, and to the letters of reference marked thereon.

' Figure 1 shows a vertical section through the middle of the re amer.

Figure 2 shows an end view of the reamer.

Figure 3 shows a section on the line a: yr

Like letters, in the figures, indicate like parts.

My invention consists in expanding or pressing'out the cutting-teeth or leaves of the reamer, by means of a tapering plug, set so that by forcing it in by a screw, it presses out the teeth, so as toream a larger hole; and also in securing the teeth in the desired position, by means ofn nut pressing against their ends.'

A is the stock or frame of the reamer, which is bored out to receive the plug B, and has slots .cnt initfor the teeth C C. The conical plug Bis fitted with escrow-thread, r 8, near its head, in to the t'raiiieor stoic lTffoTthc fiuipose of moving it in or out, and at the other end it slides in the socket E, to hold and guide it.

The screw can also be cut in this socket, instead of near the head. This plug has a slot in its head, or other suitable 'contrivance, for turning it. The cutting-teeth or leaves C C, are fitted into slots in the frame or stock A, passing through into the interior cavity, andresting upon the inclined surface m n of the conical plug 13, the inside edges of the teeth being made at such an inclination as to rest upon the plug B when the cuttingedges are in the proper position. The clamping-nut D screws on to the end of the frame or stock A, which is out down smaller to receive it, leaving a shoulder against the face oftbo nut. The ends of the teeth C C pro 'ject slightly beyond this shoulder, so that the face of the nut D presses upon them when screwed up, and holds them firmly in their places. The nut D has two of its sides 'flattened,.as shown in the drawings, or someother suitable common device, for turning it up with a wrench.

The operation of my-inrention is as follows 3' When it is desired to enlarge the reamer, the clamping-nut- D is loosened, and the conical plug B is screwed farther in. The bottom edges of the teeth C C slide n-p' farther on the conical part of the plug 13, which presses them out. The clamping-nut D is then screwed uptightagainst the ends of the teeth, and holds them firmly in their new position. When it is desired to reduce the size of the reamer, the nut D is loosened, and the plug 13 screwed out the desired distance. The teeth are then pushedin against it, and the nut D tightened as before.

Mfinvcntion can also be used as an expanding tap for cutting screw-threads, by giving the outer edges of the leaves or teeth the proper form. It can also be used as an expanding arbor or mandrel, in which case the leaves or toot-h would be without cutting-edges.

c Claim. What I claim as my invention, and desire to secure by Letters Patent, is-

.lhc combination of the devices A B C D, constructed and operating substantially as described, when used to form an expanding tool as herein specified. I

ALEX. CON KLIN Witnesses:

HENRY F. Bowen, Tnno. G. ELLIS. 

